Hi orangeroom,
Thanks for your reply and welcome. Well, never had a tune up since I didn't buy from a dealer, but bought it from Amazon. Maybe that was a lousy idea. Hoping that I can handle a fix if it's simple enough. I do keep it well cleaned out in and under the bobbin case - maybe I missed a giant wad of lint in some area?! It's a possibility. I just don't get why it purrs beautifully when I remove the top thread and bobbin. Thanks for your suggestions. I appreciate them! - Bonnie